Solid golf ball

Abstract

The solid golf ball of the invention is a one-piece golf ball or a multi-piece golf ball having a solid core enclosed directly in a cover or with an intermediate layer disposed therebetween. The one-piece golf ball or the solid core and/or intermediate layer of the multi-piece golf ball is formed of a rubber composition comprising a base rubber, an unsaturated carboxylic acid or a metal salt thereof, and a sulfur halide. Owing to the optimal degree of deformation and high resiliency of the elastic rubber portion therein, the solid golf ball has an excellent feel and an excellent flight performance.

What is claimed is:  
     
       1. A solid golf ball in the form of a one-piece golf ball or a multi-piece golf ball having a solid core enclosed directly in a cover or with an intermediate layer disposed therebetween, wherein the one-piece golf ball or the solid core and/or intermediate layer of the multi-piece golf ball is formed of a rubber composition comprising 100 parts by weight of a base rubber containing at least 80% by weight of polybutadiene treated with 0.03 to 0.5 parts by weight of a sulfur halide, 15 to 35 parts by weight of an unsaturated carboxylic acid or a metal salt thereof, and 0.5 to 2.5 parts by weight of an organic peroxide. 
     
     
       2. The solid golf ball of claim  1 , wherein said unsaturated carboxylic acid or a metal salt thereof comprises 20 to 33 parts by weight of the base rubber. 
     
     
       3. The solid golf ball of claim  1 , wherein said organic peroxide comprises 0.7 to 1.5 parts by weight per 100 parts by weight of the base rubber. 
     
     
       4. The solid golf ball of claim  1 , wherein said sulfur halide comprises 0.05 to 0.4 parts by weight per 100 parts by weight of the base rubber. 
     
     
       5. A solid golf ball in the form of a one-piece golf ball or a multi-piece golf ball having a solid core enclosed directly in a cover or with an intermediate layer disposed therebetween, wherein the one-piece golf ball or the solid core and/or intermediate layer of the multi-piece golf ball is formed of a rubber composition comprising 100 parts by weight of a base rubber containing at least 80% by weight of polybutadiene, 15 to 35 parts by weight of an unsaturated carboxylic acid or a metal salt thereof, 0.5 to 2.5 parts by weight of an organic peroxide, and 0.03 to 0.5 parts by weight of a sulfur halide. 
     
     
       6. The solid golf ball of claim  5  wherein the sulfur halide is disulfur dichloride, sulfur dichloride, sulfur monochloride, thionyl chloride or sulfur bromide. 
     
     
       7. The solid golf ball of claim  5  wherein the sulfur halide is disulfur dichloride, sulfur dichloride, sulfur monochloride, thionyl chloride or sulfur bromide. 
     
     
       8. The solid golf ball of claim  5 , wherein said unsaturated carboxylic acid or a metal salt thereof comprises 20 to 33 parts by weight per 100 parts by weight of the base rubber. 
     
     
       9. The solid golf ball of claim  5 , wherein said organic peroxide comprises 0.7 to 1.5 parts by weight per 100 parts by weight of the base rubber. 
     
     
       10. The solid golf ball of claim  5 , wherein said sulfur halide comprises 0.03 to 0.4 parts by weight per 100 parts by weight of the base rubber.